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NEET2015PhysicsCurrent ElectricityActual

The galvanometer resistance is 30 and it is connected to 2 V battery along with a resistance 2000 in series. A full scale deflection of 25 divisions is obtained. In order to reduce this deflection to 20 divisions, the resistance in series should be

Options

  1. A2470
  2. B2320
  3. C2180
  4. D2210

Correct answer

A. 2470

Step-by-step solution

Total initial resistance =G+R=30+2000=2030 Current i= 2 2030 ~A Let x be the effective resistance of the circuit, then aligned 2 V & =2030 2 2030 10^3 & =x 2 2.5 x & = 2 2.5 2 10^3 & =2500 aligned Resistance to be added =2500-30=2470

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